CYLINDRICAL ROLLER BEARINGS nomenclature
nomenclature Inner Ring Bore Size 02 = 15 mm 03 = 17 mm (for inner ring bore ≥ 20 mm): bore code x 5 = bore diameter 04 = 4 x 5 = 20 mm See Standard Styles, fig. 17 below. For two-row bearings, use NNU.
NU
Enhanced Geometry
22
36
Dimension Series Width Series + Diameter Series 10 = width series 1; diameter series 0 (dimension series 10) 2 = width series 0; diameter series 2 (dimension series 02) 22 = width series 2; diameter series 2 (dimension series 22) 3 = width series 0; diameter series 3 (dimension series 03) 23 = width series 2; diameter series 3 (dimension series 23)
E
MA
Radial Internal Clearance
C3
Cage Type MA = Timken’s single-piece, land-riding, machinedbrass cage
Fig. 16. Metric ISO radial cylindrical roller bearings nomenclature.
NU, RIU, RU
N, RIN, RN
NJ, RIJ, RJ
NF, RIF, RF
NUP, RIT, RT
NP, RIP, RP
Fig. 17. Standard cylindrical roller bearing styles metric/inch.
Bore Inch: 200 20.0 in. 42 4.25 in. 43 4.375 in. standard sizes are 4 - 27.20 inch
METRIC
Metric: 200 200 mm 210 210 mm 220 220 mm standard sizes are 100 - 600 mm
200
Series: two digits indicates metricenvelope dimensions three digits indicates inchenvelope dimensions
See Standard Styles, fig. 17 above. “I” identifies inch-size bearings.
RU
02
OA107
Modifications: (First two letters are assigned by Timken engineers) Letter other than “O” in first position indicates modification to inner ring. Letter other than “O” in second position indicates modification to outer ring.
Fig. 18. ABMA radial cylindrical roller bearings nomenclature.
56
TIMKEN CYLINDRICAL ROLLER BEARING CATALOG
R3 Radial Internal Clearance: R1 < R2 R2 < R3 R3 = Standard R4 > R3 R5 > R4